PP_(333)对元帅苹果幼树生长、结果的影响

EFFECTS OF PP_(333) ON THE GROWTH AND FRUITING OF YOUNG ‘DELICIOUS' APPLE TREES

对5年生的‘元帅’苹果幼树,叶面喷施不同浓度的PP_(333)。结果表明,PP_(333)处理树新梢生长受抑制,叶片面积增大,厚度和叶绿素含量增加,叶数不减少;促进成花,提高座果率,最终增加产量。处理对果实L/D值无明显影响,不减少单果重。5—6年生的‘元帅’,处理当年即显示出抑制生长、促进成花的作用。处理后第2—3年的效应表现更为明显,并提高座果率。

5-year-old 'Delicious' apple trees were treated by spraying their leave; with different concentrations of PP_(333) ( paclobutrazol ) . The results indicated that PP_(333) inhibited the shoot growth and increased leaf area, leaf tnickness and chlorophyll content, but didn't affect the number of leaves. The treatment promoted flowering, fruit-setting and finally increased the yield. The L/D ratio of fruit decreased, but the single-fruit weight didn't decrease. These responses appeared at the first year of treatment and showed more intensive effect at the second and third year of treatment. The control, treated with B9 of 2500ppm, showed less effective than PP_(333) and didn't show continous effect.